/*
 * Copyright 2016-2017 lei.xu<xulei2008xulei@163.com>.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.san21go.jfinfunc.financ.npv;

import org.san21go.jfinfunc.AbstractFunction;
import org.san21go.jfinfunc.FinFuncRuntimeException;

public class NPV extends AbstractFunction<Double> {
	private double[] values;
	private double rate;

	public NPV(double[] values, double rate) {
		super();
		this.values = values;
		this.rate = rate;
	}

	@Override
	public Double evaluate() throws FinFuncRuntimeException {
		double npv = 0;
		for (int i = 1; i < values.length; i++) {
			npv += values[i] / Math.pow(1 + rate, i);
		}
		return npv;
	}
}
